科研之友
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摘要
Silver carbonate treatment of 3-thenyl-substituted hydrazonoyl chloride (3) promoted the in situ generation of the corresponding nitrilimine (4) which constitute the key intermediate in the three step synthesis of both thieno[2,3-f]pyrazolo[1,5-a][1,4]diazepine and thieno[2,3-f]pyrazolo[1,5-a][1,4]oxazepine skeletons. The concurrent formation of unusual pyridazine derivatives arising from the electrophilic attack of a nitrilium cation to the carbon-carbon double bond is also discussed in some detail.
- 出版日期2010-4-1
